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Bithumb says hackers breached internal system and leaked personal data

South Korea's second-largest crypto exchange is investigating whether customer data was exposed after an outside party accessed its internal mobile groupware system, Yonhap reports.

Why it matters: The breach hits one of South Korea's largest exchanges and follows a wave of data leaks at the country's financial firms, with leaked customer data a known route to phishing and SIM-swap attacks.

InvestIn.News NewsDesk · 1 min read
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Picture from Decrypt for: Bithumb says hackers breached internal system and leaked personal data
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Original reporting: Decrypt Agent, Decrypt

Key points

  • Bithumb said an unauthorised outside party accessed its internal mobile groupware system, causing a personal data leak, according to Yonhap.
  • An industry source told Yonhap that some Bithumb customer information had leaked; the exchange is still investigating.
  • Daishin Securities reported 38,490 customers' names, emails and phone numbers leaked, and Mirae Asset Global Investments also confirmed a breach.

The South Korean exchange, the country's second largest, is investigating whether customer information was among what was exposed, Reuters reported. An industry source told Yonhap that some personal data belonging to Bithumb customers had leaked.

The Bithumb hack was one of three breaches reported by South Korean financial firms on 28 October, local time. Brokerage Daishin Securities said the names, email addresses and mobile numbers of 38,490 customers were leaked after it spotted signs of unauthorised access in the week of 19 October, and it will compensate customers under the law.

The incident adds to a difficult 2026 for Bithumb.

Read the full story on Decrypt

Live updates on NewsFeeds:AltcoinsDesk editor: Keshav Aggarwal (accountable for this page; this summary was not edited by hand)

How this was produced: an AI model wrote this summary of Decrypt’s report, which we credit and link above. Read our Editorial and AI policy. Spotted a mistake? See Corrections.

Not investment advice. Read the risk disclaimer.

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